Imagine we've discovered a planet orbiting another star at an average distance of 1 AU with an orbital period of 6 months. The planet has a moon that orbits the planet at the same distance as our Moon, but it takes 2 months to complete an orbit. What can we infer about this planet?
A) It is more massive than Earth.
B) It is less massive than Earth.
C) It has the same mass as Earth.
D) We cannot answer the question without knowing the mass of the star.
E) We cannot answer the question without knowing the mass of the moon.
B) It is less massive than Earth.
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The temperature is observed to decrease from
to 
during the evening of a very hot day. What is the relative change in the speed of sound over this time interval?
A. -15% B. -28% C. -1.5% D. -3%
The above figure is an example of a vector image.
Answer the following statement true (T) or false (F)
Electromagnetic waves are generally
A. standing waves. B. longitudinal waves. C. transverse waves. D. a 50/50 combination of transverse and longitudinal waves.
Describe the properties of space in the vicinity of a black hole
What will be an ideal response?